I am following this movie tutorial (text Edition of a similar). I've followed the exact same code And that i am receiving this mistake: You could apply readonly key phrase, but in this way, You need to initialize readonly fields only in constructor. What is actually more, nothing stops you https://luxuryprojectsgurugram.in/luxury-projects-gurugram-the-future-of-upscale-living-in-indias-fastest-growing-city/